如何从静态上下文中引用非静态方法 [英] How do I refrence a non- static method from a static context
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问题描述
我有一个函数的构造函数,但是当我编译我的主要方法,非静态方法区域不能从静态上下文引用。我知道它的一个简单的修复,我只是不能很好地到那里。感谢
I have this constructor with a function however when i compile my main method i non-static method area cannot be referenced from a static context. I know its a simple fix i just cant quite get there. Thanks
public class Rect{
private double x, y, width, height;
public Rect (double x1, double newY, double newWIDTH, double newHEIGHT){
x = x1;
y = newY;
width = newWIDTH;
height = newHEIGHT;
}
public double area(){
return (double) (height * width);
}
和此主要方法
public class TestRect{
public static void main(String[] args){
double x = Double.parseDouble(args[0]);
double y = Double.parseDouble(args[1]);
double height = Double.parseDouble(args[2]);
double width = Double.parseDouble(args[3]);
Rect rect = new Rect (x, y, height, width);
double area = Rect.area();
}
}
推荐答案
您需要在类的实例上调用方法。
You would need to call the method on an instance of the class.
此代码:
Rect rect = new Rect (x, y, height, width);
double area = Rect.area();
应为:
Rect rect = new Rect (x, y, height, width);
double area = rect.area();
^ check here
you use rect variable, not Rect class
Java is Case Sensitive
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